Upper respiratory infection due to Haemophilus influenzae

An upper respiratory infection due to *Haemophilus influenzae* is a localized bacterial infection of the mucosal tissues of the upper respiratory tract, most commonly presenting as acute otitis media, rhinosinusitis, or nasopharyngitis

An upper respiratory infection due to *Haemophilus influenzae* is a localized bacterial infection of the mucosal tissues of the upper respiratory tract, most commonly presenting as acute otitis media, rhinosinusitis, or nasopharyngitis It predominantly affects infants, young children, older adults, and individuals with underlying respiratory compromise or immunodeficiency

An upper respiratory infection due to *Haemophilus influenzae* is a localized bacterial infection of the mucosal tissues of the upper respiratory tract, most commonly presenting as acute otitis media, rhinosinusitis, or nasopharyngitis Pathophysiologically, non-encapsulated (nontypeable) or encapsulated strains of the pleomorphic gram-negative bacterium colonize the nasopharynx, adhere to mucosal epithelial cells, disrupt mucociliary clearance, and trigger intense mucosal inflammation

It predominantly affects infants, young children, older adults, and individuals with underlying respiratory compromise or immunodeficiency

Pathophysiologically, non-encapsulated (nontypeable) or encapsulated strains of the pleomorphic gram-negative bacterium colonize the nasopharynx, adhere to mucosal epithelial cells, disrupt mucociliary clearance, and trigger intense mucosal inflammation

Pathophysiologically, non-encapsulated (nontypeable) or encapsulated strains of the pleomorphic gram-negative bacterium colonize the nasopharynx, adhere to mucosal epithelial cells, disrupt mucociliary clearance, and trigger intense mucosal inflammation

Defining clinical features typically include purulent nasal or aural discharge, mucosal congestion, otalgia, facial pain, sore throat, and low-grade to moderate fever

Defining clinical features typically include purulent nasal or aural discharge, mucosal congestion, otalgia, facial pain, sore throat, and low-grade to moderate fever

Defining clinical features typically include purulent nasal or aural discharge, mucosal congestion, otalgia, facial pain, sore throat, and low-grade to moderate fever